linux-kernel - Re: [patch] sysfs: Fix build when sysfs is disabled

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Date:	Fri, 25 Jan 2013 21:52:35 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Kristen C. Accardi" <kristen.c.accardi@...el.com>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] sysfs: Fix build when sysfs is disabled

On Friday, January 25, 2013 12:13:59 PM David Rientjes wrote:
> "sysfs: Functions for adding/removing symlinks to/from attribute groups" 
> causes a build failure when CONFIG_SYSFS is disabled:
> 
> drivers/acpi/power.c: In function 'acpi_power_hide_list':
> drivers/acpi/power.c:463: error: implicit declaration of function 'sysfs_remove_link_from_group'
> drivers/acpi/power.c: In function 'acpi_power_expose_list':
> drivers/acpi/power.c:486: error: implicit declaration of function 'sysfs_add_link_to_group'
> 
> We need to define empty functions for this config to avoid ifdefs in the 
> code.

Can you please send me the .config that triggered those errors?  It will be
useful for future build testing.

Thanks,
Rafael


> Signed-off-by: David Rientjes <rientjes@...gle.com>
> ---
>  include/linux/sysfs.h | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
> --- a/include/linux/sysfs.h
> +++ b/include/linux/sysfs.h
> @@ -330,6 +330,18 @@ static inline void sysfs_unmerge_group(struct kobject *kobj,
>  {
>  }
>  
> +static inline int sysfs_add_link_to_group(struct kobject *kobj,
> +		const char *group_name, struct kobject *target,
> +		const char *link_name)
> +{
> +	return 0;
> +}
> +
> +static inline void sysfs_remove_link_from_group(struct kobject *kobj,
> +		const char *group_name, const char *link_name)
> +{
> +}
> +
>  static inline void sysfs_notify(struct kobject *kobj, const char *dir,
>  				const char *attr)
>  {
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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